Locking device for eccentric bushings



F. J. McAVOY.

LOCKING DEVICE FOR ECCENTRIC BUSHINGS.

APPLICATION FILED JAN. 17, 1920- 3 I 24 I 1 l M WITNESSES Patented July27, 1920.

IN VE/V TOR A TTOR/VEVS UNITED STATES FRANCIS JOSEPH MoAVOY, 0F NEWARK,NEW JERSEY.

LOCKING DEVICE FOR ECOENTBIC BUSHINGS.

Specification of Letters Iatent. Patented 7 July 27,1920.

Application filed January 17, 19 20. Serial No. 352,096 r To all whom itmay concern.

Be it known that I, F RANCIS JOSEPH M0- Avov, a citizen of the UnitedStates, and a resident of Newark, in the county of Essex and State ofNew Jersey, have invented a new and Improved Locking Device forEccentric Bushings, of which the following is a full, clear, and enactdescription.

The invention in its general aspect relates to internal combustionengines, such as are used in automobiles and other vehicles, and in itsparticular application the invention relates to locking devices foreccentric bushings such as shown and described in (cheapplication forLetters Patent of the United States, No. 327,382, filed by me onSeptember :30, 1919.

The object of the present invention is to provide a new and improvedlocking device for eccentric bushings arranged for convenient attachmentto the engine or motor to lock the eccentric bushing in place and toallow of using the device as a spanner wrench for turning the eccentricbushing after the same has been unlocked.

Another object is to insure accurate fitting of the locking device onthe timing gear case of the motor.

Vith these and other objects in view, the invention consists of certainnovel features of construction as hereinafter shown and described andthen specifically pointed out in the claims.

A practical embodiment of the invention is represented in theaccompanying drawings forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure 1 is a sectional side elevation of the improved locking device asapplied, the section being on the line 11 of Fig, 2;

Fig. 2 is a cross section of the same on the line 22 of Fig. 1;

Fig. 3 is a face View of the bracket; and

Fig. 4 is an edge View of the same.

In internal combustion engines as now generally constructed it isoccasionally necessary to tighten the sprocket chain driven from themotor shaft and driving the generator shaft, the motor cam shaft and theig nition timer shaft. The sprocket wheel con nected with the generatorshaft is journaled on an eccentric bushing and when it becomes necessaryto tighten the sprocket chain then the bushing is unfastened and turnedto correspondingly shift the sprocket wheel with a view to tighten thesprocket chain. The

means heretofore employed for fastening the bushing in place made. itnecessary to disassemble a number of adjacent parts of the motor inorder to allow turning of the bushing and tightening of the sprocketchain. In practice, this operation usually consumed several hours. Withmy improvement presently described in detail the adjustment can be madein about ten minutes as this disassembling of the parts of the motor isnot necessary.

The bushing 10 is mounted to turn in a bearing 11 forming part of themotor frame 12, and the bushing is. provided at its outer end with aneccentric 13 on which is mounted to turn the motor generator sprocketWheel 14 connected by a sprocket chain, indicated in broken lines, withsprocket wheels on the motor cam shaft which actuates the Valves anddrives the ignition timer shaft. The motor generator sprocket wheel 14is further provided ,with a coupling member 15 slidingly connected witha coupling member 16 secured on the shaft 17 of the motor generator 18to actuate the latter. 7

The bushing 10 is provided with a flange 20 fitting against the innerface of the bearing 11 and spaced a short distance from the motorgenerator 18, as plainly shown in Fig. 1. The face of the flange 20 isprovided with spaced recesses 22 arranged in a circle concentric withthe peripheral face of the flange" 20 and two oppositely disposedrecesses 22 are engaged by lugs or pins 23 formed on one face of abracket 24 removably attached to the motor frame 12. For this purposeuse is made of a stud bolt 30 having threadedends 31 and 32 and a collar33 between the threaded ends. The threaded end 31 screws in the frame 12and its outer end is engaged by a lock nut 34 securely to lock the studbolt 30 in position on the frame 12.. The collar 33 abuts against theinner face of the frame 12 and on 'the threadedend 32 screws a nut 35which extends through an opening 36 formed in the bracket 24. The nut 35is provided with a polygonal head 37 which abuts against the face of thebracket 24, as

plainly shown in Fig. 1. The upper end of the bracket 24 is providedwith a flange 40 slightly rounded off in a transverse direction andadapted to rest on the inner face of the frame 12. The lower end of thebracket 24 is in the form of a fork having two fork members 41 and 42carrying the pins 23 previously mentioned, and on the said fork members41 and 42 are formed two lugs 43 and 44 adapted to rest against the faceof theflange 20. By reference toFigs. 1

and 4 it will be noticed that the lugs '43, 44-

are less in height than the pins 23 to allow the latter to enter thecorresponding recesses 22 at the time the lugs 43 and 44 are seated onthe face of the flange 20. It will also be noticed that by the use ofthe flange 40 and the lugs 43, 44, a three-point contact is provided forthe bracket 24 to hold the latter securely in position on screwing upthe clamping nut 35 on the stud bolt 30. By rounding off the flange 40 apoint of contact is provided between the flange and the frame 12 toinsure proper contact of the flange 40 on the frame 12 and the lugs 43,44 on the face of the flange 20. The bracket 24 is preferably reinforcedby integralribs 48 located on opposite sides of the opening 36.

. When the bracket 24 is in position as shown in Figs. 1 and 2 then thepins 23 engage sundry of the recesses 22 and consequently the bushing 10is locked againstturning in its bearing 11. IVhen it is desired to turnthe bushing 10 in the bearing 11 for tightening the sprocket chainpassing over the sprocket wheel 14 then it is only necessary for theoperator to unscrew the nut from the stud bolt 30 to unfasten thebracket 24, which can now be used as a spanner wrench for turning thebushing 10 face of the flange 20.

It is understood that very little room is had between the flange 20 ofthe bushing 10 and the motor generator 18, but as the bracket 24 takesup very little room it can be readily put in place for locking the bushing against turning or for turning the bushing to adjust the eccentric13 for tightening the sprocket chain, as above explained.

From the foregoing it will be seen that by the arrangement described theoperator.

the sprocket, chain without disturbing the position of any one of theparts of themotor.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In an internal combustion motor, an eccentricbushing provided with spaced recesses arranged in a circle concentric tothe peripheral face of the bushing, a bracket provided with pins adaptedto engage sundry of the said recesses, and fastening means detachablyfastening the bracket to a fixed part of the motor, the said bracketwhen fastened in place bythe said fastening means holding the bushingagainst turning, and the said bracket when unfastened by the saidfastening means serving as a spanner wrench to turn the bushing.

2. In an internal combustion motor, an cecentric bushing provided withspaced recesses arranged in a circle concentric to the peripheral faceof the bushing, a bracket provided with pins adapted to engage sundry ofthe said recesses, the said bracket having an opening therethrough, astud bolt attached to a'fixed part of the motor, and a clamping nutscrewing on the said stud bolt, the said clamping, nut extending throughthe said bracket opening and the said nut having a head abutting againstthe face of the bracket to clamp the latter in place on the said fixedpart of the motor.

3. In an internal combustion motor, an eccentric bushing provided withspaced recesses arranged in a circle concentric to the peripheral faceof the bushing, a bracket provided with pins adapted to engage sundry ofthe said recesses, the said bracket having at one end a fork on whichthe pins are located, the said bracket having an open: ing intermediatethe fork and the other end,

the latter having a rounded off flange adapted to rest on a fixed partof the motor, and the members of the fork having lugs adapted to rest onthe face of the bushing, a stud bolt held on the saidfiXed motor part,and a nut extending through the said bracket opening and screwing on thesaid stud bolt, the said nut having a head engaging the face of thebracket. v

FRANCIS JOSEPH MoAVOY.

